Samuel j



(No Modell.)

` s J. SHIMER. f KNIPBEOR WooD WORKING MAGHINBS. No. 296.077.

PatentedApr. I, 1884,;

Alzforney ionica?.

Farrar KNIFE FOR wooo-WORKING MACHINES.

SPECIFICATION forming part of Letters Patent No. 296,077, dated April 1, 1884.

` Application filed February 2, 1884. (No model.) l V i `.To all` whom it 'may concern.-

` p land, in the State of Pennsylvania, have invented a new and useful Knife or Cutter for Wood-Working Machines, of which the fol- `lowing is a specification.

My invention relates to certain new and useful improvements in knives7 ^or eutters7 for wood-working machines, especially those knives or cutters intended to be secured to a rotary cutter-head.

Previous to myinvention 'it has been found that the cutter-heads of wood-working machines often present a rough face where the knives are secured, owing to the cutting-edges of said knives being in line with' their under faces, and thus forcing the chips and splinters raised by the cut against and in between the `cutters and their heads. The bolts employed to secure the knives to said heads are also subjected to a great amount of strain on account `of such wedging, thereby requiring frequent oversight and adjustment of `thecutting apparatus in order to secure uniform finish of the work. i

The object of the present invention is to provide a simple and economical cutter or knife for wood-working machines that will present aperfect chip-break adapted to wear into'shape, and thusA automatically adjust itself to thefcut without the necessity of special attention or adjustment during `the operation of the machine, and at the same time prevent the chips or splinters wedging between the knives or cutters and the heads to which they may be secured.

Afurther'object ofthe invention is to secure a smooth cut over cross-grained or knotty lum ber, as by the peculiar construction of the knife 'or cutter the chip-break causes the chip to roll or curl close to the cutting edge and pre- K vents a split with the grainfof the wood.` This peculiar construction `of the knife or cutter l also prevents unnecessary strain 'upon the bolts securing it to the cutter-head.

I accomplish these obj ects by rigidly uniting or affiXing to the face of the tool or cutter, next f5o to the cutting-edge thereof, a facing or layer "of soft metal. The metal of this facing should be of such a nature as to readily wear away by contact with the chips or shavings, in order that the chip-break may be formed between the steel of the cutter and the face of the cutter-head without stra-in on theparts.

The invention therefore consists in forming the steel knives or cutters ordinarily employed in wood-working machineswith a coating or face of soft metal, as will be hereinafter more fully described with reference to the aceomp`anying drawings, in which- Figure 1 represents a crosssection of a rotary cutter-head, showing the application of my invention; Fig. 2, a detail perspective view of a planer-knife constructed in accordance with my invention; Fig. 3, a longitudinal vertical section on line wlw, Fig. 2; and Fig. 4 is a transverse sectional view of the knife.

A represents a planer-knife of the ordinary construction brought to a cutting-edge, as shown at a, and to the side next the cutting-edge is soldered or otherwise rigidly secured a layer of soft metal, forming a coating or face, B, the thickness of this layer being varied at pleasure, in order to carry out the above-enumerated objects of the invention in the best possible manner. The knife A, with its soft-metal coating or face B, is secured to the cutter-head C 4on the line b c by means of bolts D, such means being that usually employed for that purpose. It will be readily seen that the cutting-edge a is not on a line with the under face of the knife, and therefore the chips or splinters raised by the cut cannot wedge themselves in between the head and cutter, while the softmetal coating or face, standing up sufficiently close to this edge, forms a perfect chip-break, and will wear back far enough and fast enough to give the 'knife at all times a clear and equal cut. The chip-break formed by -the soft-metal coating or face to the knife, gradually wearing into shape, needs no special adjustment or attention, and the cutting-edge, backed by this soft-metal chip-break, rolls or curls the .chips up close thereto, and `prevents a splitafter the grain when Working crossgrained or knotty lumber, thereby insuring a smooth cut. The soft-metal coating or face also forms a yielding and frictional medium, and consequently the bolts holding the knife to the cutter-head are subjected to less strain than is usually the case.

This improvement applies to all sizes and IOO kinds of` knives used in woodwvorking inaehinery, 'and especially to those adapted to be secured to a rotary Cutter-head in the inanner herein described.

What I claim as my invention, and desire to secure by Letters Patent, is-

1. A knife or cutter for Wood-working machines,eonsisting of a steel body having rigidly secured to one of its faces a -coating of soft metal, substantially as and for the purpose set forth.

2. A knife or cutter for woodworking niaohines, consisting of a steel body -having soldered or otherwise rigidly secured thereto a thin layer or coating of soft metal, substantially as and for the purpose set forth.

In testimony whereof I have hereunto set my hand in the presence of two attesting Witnesses.

n SAMUEL J. SHIMER. Attest:

ELMER S. SHIMER, JOHN A. BECK. 

